The Experimental Study of Dolomite Dissolution and Pore Characteristics in Shibing, Guizhou

With dolomite in Shibing of Guizhou Province as the study object, the authors analyzed its dissolution characteristics and pore characteristics macroscopically and microscopically. Some conclusions have been reached: (1) In many factors that influence the development of Shibing karst, the most fundamental factor is mineral composition, the most critical factor is water, and pore characteristics play a supporting role; (2) The dissolution amount on per unit surface area of superfine grain Shibing dolomite is generally greater than the amount of fine-grained dolomite rock sam-ple. Under the same circumstances of grain dissolution principle, the dissolution amount of dolomite is in positive proportion with CaO and MgO content and the influence of MgO content is larger than that of CaO content. (3) The dissolution rate of Shibing dolomite is not only controlled by particle size of the mineral particles, but also by the internal pore structure characteristics of the rock. The larger the particle size, the higher the porosity, the better the connectivity, the more the beneficial solution seeps into pore, and the greater the amount of dissolution; (4) Dissolution of dolomite is the result of many factors, and all factors must be separated one by one to make a detailed analysis from the macroscopic and microscopic view. On such a basis, more information about the regularity of the karst development can be obtained through a comprehensive study.